Java & Haskell
Resources: for API documentation and Concurrency Tutorial. Cut and paste from these
is allowed.
https://docs.oracle.com/javase/8/docs/api/
https://docs.oracle.com/javase/tutorial/essential/concurrency/
1. Look at the available methods in the Thread class. Is there a method that will let a
thread sleep? How do you call it? [Beware of the exception.]
2. Create a Java class that derives from the Thread class. The run method of the
class should write something to the screen, sleep for a little while, and then write
something to the screen again before finally returning.
3. Same as previous but as a class that implements the Runnable interface.
4. Write a Java program that creates one thread from each of the classes above and then
starts them both. The program should wait until both threads have finished before
ending.
5. Create a Counter class using either of the above alternatives that has a private
(static) tally, a public getValue method that returns the current tally, and whose
run method increments the tally 107 times.
6. Run two Counter threads in parallel. What is the tally after both threads have
terminated?
7. Repeat 2 in Haskell. That is, create and run a Haskell thread that prints, sleeps and
prints before exiting. You will need to import Control.Concurrent and for
sleeping you need threadDelay.